Patents by Inventor Mingqin Duan

Mingqin Duan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • SYSTEMS AND METHODS FOR MANAGING PRESSURE IN A WELLBORE
    Publication number: 20160168934
    Abstract: A method for drilling a subsea well from a rig through a subsea wellhead below the rig includes employing a single gradient or dual gradient drilling system that includes a drill string that extends from the rig into the well and surface mud pumps for pumping drilling fluid through the drill string and into a well annulus of the well. The drilling system includes a subsea rotating device for conducting the drilling fluid from the well annulus and through a solids processing unit. A subsea pump then conducts the drilling fluid from the solids processing unit to a return line back to the rig. The surface mud pump and subsea pump are staged in coordination to trap pressure and/or remove pressure in the well annulus to maintain a selected pressure gradient in the well annulus.
    Type: Application
    Filed: February 23, 2016
    Publication date: June 16, 2016
    Inventors: Charles W. Weinstock, Mingqin Duan
  • Systems and methods for managing pressure in a wellbore
    Patent number: 9316054
    Abstract: A method for drilling a subsea well from a rig through a subsea wellhead below the rig includes employing a single gradient or dual gradient drilling system that includes a drill string that extends from the rig into the well and surface mud pumps for pumping drilling fluid through the drill string and into a well annulus of the well. The drilling system includes a subsea rotating device for conducting the drilling fluid from the well annulus and through a solids processing unit. A subsea pump then conducts the drilling fluid from the solids processing unit to a return line back to the rig. The surface mud pump and subsea pump are staged in coordination to trap pressure and/or remove pressure in the well annulus to maintain a selected pressure gradient in the well annulus.
    Type: Grant
    Filed: February 14, 2013
    Date of Patent: April 19, 2016
    Assignee: Chevron U.S.A. Inc.
    Inventors: Charles W. Weinstock, Mingqin Duan
  • SYSTEMS AND METHODS FOR MANAGING PRESSURE IN A WELLBORE
    Publication number: 20130206423
    Abstract: A method for drilling a subsea well from a rig through a subsea wellhead below the rig includes employing a single gradient or dual gradient drilling system that includes a drill string that extends from the rig into the well and surface mud pumps for pumping drilling fluid through the drill string and into a well annulus of the well. The drilling system includes a subsea rotating device for conducting the drilling fluid from the well annulus and through a solids processing unit. A subsea pump then conducts the drilling fluid from the solids processing unit to a return line back to the rig. The surface mud pump and subsea pump are staged in coordination to trap pressure and/or remove pressure in the well annulus to maintain a selected pressure gradient in the well annulus.
    Type: Application
    Filed: February 14, 2013
    Publication date: August 15, 2013
    Applicant: Chevron U.S.A. Inc.
    Inventors: Charles W. Weinstock, Mingqin Duan